I googled, but couldnt find an "orange toast" recipe that wasnt french toast. Try your ingredients, melted butter, sugar, and zest. Spread it on your bread then toast it in the oven. Maybe a bit of orange juice in the mixture would be good too.

I recall (years back) Martha Stewart making a French toast-like recipe that used orange liqueor...though that doesn't quite sound like what you want.

I would suggest that you make some orange zest sugar (take a mason jar or other similar container with a tight lid, and create layers of dried citrus citrus peel and fine grain (castor) sugar. Leave that for about a week and you have instant citrus sugar (for an extra kick try adding a vanilla bean pod). From there you could add the sugar to eggs or just toast the bread in a frying pan with butter (or oil) and sprinkle the citrus sugar on each side of the bread as you flip it over, keeping in mind that sugar and heat will quickly equal caramel Or you could flash it under the grill (broiler) for a minute to turn the sugar golden (toast the bread first, spread on butter and sugar and pop under the broiler). Yummm - I think I might have to try this now, it's peaked my curiosity.